Place the photo above the photo template piece in the layers palette. Then in your layers palette, move your cursor on the line between the two layers while holding down the alt-key. It will turn into a little arrow thing. When it does click it. That does the same thing as Cntrl+Alt+G. In the layers palette, you will see the photo layer more to the right a little. Looks like this:
Something else to keep in mind that sometimes throws people - if your photo is physically smaller than the template piece you may not see a change in the canvas and you will probably need to resize the template piece.